A Algorithm of Solving Self-interference in WLAN/WPANS Based on Distributed Dynamic Power Control

At present, IEEE802.11 has three high-speed PHY specifications: 802.11b, 802.11a, and 802.11g. Although 802.11b/g has 11 channels in the 2.4 GHz unlicensed band, there are only 3 non-overlapping channels. The limited number of usable channels may have a significant impact on throughput in 802.11b/g dense wireless local area networks and wireless personal area networks (WLAN/WPANs) and self-interference is inevitable. In some cases, the system can not work because of the serious self-interference. This paper presents a distributed dynamic power control algorithm (DDPCA) that can improve per-user throughput significantly in dense WLAN/WPANs, solving self-interference problems which are caused by the deficiency of communication channels, particularly for nonuniform traffic conditions. Computer simulations show that given any traffic load distribution and any initial channel allocation, the algorithm converges to an equilibrium state in a short time, in which the overall throughput of the network is significantly improved. The proposed algorithm can change its threshold self-adaptively and has significant practical value due to its simplicity and effectiveness